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蒸腾比（名词解释)

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生理需水（名词解释)

稳定性选择（名词解释)

成穗率（名词解释)

Mediarecoverycansometimesbestoppedbytheinabilitytoreadpastacertainpointintheredostream.Thisisoftenreferredtoasstuckrecovery”.BeforeOracle9i，the
DatabaseAdministratorhadfewoptionstodealwithstuckrecovery.Ifthecorruptredocouldnotberecoveredfromsomeothersource，thenalltransactionsthatcommittedafterthecorruptpointintheredosteamwouldbelost.
Oracle9ichangesthatwiththeTrialRecoveryfeature.TrialRecoverisusedtotesttheapplicationoftheredologstothedatabase.
WhatarethreeothercharacteristicsofTrialRecovery（）